WHAT IS A BLOG  

We can say a blog (a mixture of the term "Web log") is a site usually look after by an individual , with daily entries of commentary, descriptions of events, or other material such as graphics or video. A blog is a personal diary.You can write any thing in your blog what ever it may be but until and unless its causes harm to others or hurt other’s sentiments.Basically there are no predefined rules for writing a blog. Many renowned people write a blog about their own life.you can take example of the great Indian actor or the legend of India AMITABH BACHAN. Recently he published his own blog. So I guess after reading this you can know what a BLOG basically is.
But I must say blogger has changed the blog world completely.its very simple to use and user friendly. And the second thing which comes in blog is blogging. Blogging is defined as updating the blog.
The main features that make blogs different from other websites are:
• content is written in a chronological fashion
• BLOGGING - content is updated regularly.
• readers have the possibility to leave comments
• other blog authors can interact via trackbacks and pingbacks
• content is syndicated via RSS feeds

SO WHAT IS A BLOG…
In simple words blog is a weblog and updating ur blog is known as BLOGGING. So I guess after this you can explain some one that WHAT IS A BLOG